Preheat oven to 350°. Spray a 12x9x1-inch jelly roll pan with baking spray with flour; line bottom of pan with parchment paper, and spray again.

In the bowl of a stand mixer fitted with the whip attachment, beat eggs and vanilla extract at high speed until light and fluffy, about 5 minutes. With mixer running, gradually add sugar to egg mixture. Reduce mixer speed to lowest setting, and add flour, salt, and lemon zest. Beat until combined.

Spread batter into prepared pan, smoothing top with a spatula. Bake for 12 minutes; remove from oven, and let cool completely on a wire rack.